Is there a image supposed to be attached?
Is simply their difference,
Here is your answer

REASON:
SSS congruency states that, if all the three sides of a triangle are respectively equal to the corresponding sides of another triangle then both triangles are said to be
.
Here, in both triangles
7units=7 units
8units=8units
Middle side is common to both triangles so it is equal.
Hence, both triangles are congruent by SSS
HOPE IT IS USEFUL
Answer:

Step-by-step explanation:
=)
Hope this helps!